"Because of irregularities in the definition and usage of terms for byte multiples, the exact number can be either one of the following:

or 1 septillion 1,000,000,000,000,000,000,000,000 bytes — 1000^8, or 10^24. 1,208,925,819,614,629,174,706,176 bytes — 1024^8, or 2^80. Because of these irregularities, the term "yobibyte" has been proposed as an unambiguous reference to the latter value. (See binary prefixes.) "

The question was unclear from the beginning, as confirmed by its reference. I want my point! :)